Reamer



June 5, 1945 A. kl... ANDERSON 2,377,660

REAMER Filed Jan. 16, 1945 Patented June 5, `1945 UNITED STATES iPlrrENT OFFICE Axel L". Anderson, Rockford, Ill., assignor `to Jack- & Heintz, Inc., Bedford, Ohio, a corporation of Ohio `"ApplicationJanuary i6, 1343SerialNo. 472,579` I (o1. vvk-72) A r" 1 p 6 Claims.

The present .invention relates to a novel and improved construction for a reamer or like tool,

Itis conventional practice to make reamers with the cutting blades either integral or brazed on the shank. When the blades become too worn for further service it is customary to discard the reamerand `use a new one. The object of this invention is to provide an improved reamer with removable blades which may be 4 either replaced or reground whenA worn. A particular object is to provide a novel construction on a reamer shank.

`The invention is best understood with reference to the accompanying drawings in which:`

Y Figure 1 is a view in side elevation of a reamer constructed according to the principles of j the invention; f s

"Figure 2 is `an end elevational view reamershown in Figure 1;

"Figure `3 is a cross sectional View taken on the line 3-3 of Figure 1;

`Figure 4 is a longitudinal sectional view; 4Figure 5 is an enlarged view in partial sectonillustrating the manner in which a removable blade iswclamped on the shank;

' Figure 6 is an enlarged partial elevational view illustrating the principle of the clamping of the action; and I i Figurei'l is-a fragmentary side view of a modied fori'n of theinvention.

In the preferred embodiment illustrated the numeral `I indicates a tubular sleeve constituting the shank of the reamer. `The sleeve II is provided with -an internal shoulder 2 in one end, the other end having an end wall 3 provided with acentral depression or opening 41 for a purpose which will later appear. The sleeve I is also provided with slots 5 near one end and extending through end wall 3 in themanner shown. In the embodiment shown in Figures `1 tor the slot 5 is cuton adiagonal, or spiral, for a purpose whichwill presently appear. In the other end of sleeve I a plug 6 seats against the shoulder 2 and receives the head end of a Screw l, The threaded end of screw 1 engages a sliding bolt 8 guided by a transverse pin 9 riding in slots I in the sleeve. The bolt 8 is provided with slots II in register with the slots 5 when the bolt'is moved nearly to the limit'of its movement to the right.

When the slots 5 and II are in register, hardened cutting blades I2 may be inserted in the manner shown. Rotation of, screw 1 draws the sliding bolt 8 to the left moving slot II out of for removably clamping individual cutting blades register with slot `5 and thereby binding the blades I2 rmly in place. Figure 6 illustrates how the slots move out of registry when the bolt 8 slides to the left in the` `sleeve I, in the absenceof the blades I2; The diagonal arrangement ofthe slots is such `that the sleevell will back up the blades I2 for most effective operation under right hand rotation, of the tool :in use. This feature is illustrated by the enlarged partial sectional view in Figure 5 looking towardthe left in Figures `1 and 4.` Tightening of screw 'I has moved bolt 8 and slot II longitudinally which hasthe effect of laterally separating slotsII and 5 so as to rmly bind a portion I3` of bolt 8 against the front face I8 of blade I2gwhich is thereby backed up against a `portion vIII of sleeve l. The term front face of blade `I2 as used herein refers to the cutting side of the blade when rotated in the direction of the arrow in" Figure `5. In order to clearly illustrate the above described binding and backing action in Figure `5, spaces `IIz and I'I of exaggerated width have been shown where `there is no `pressure against the blade, as would be the case if the blade were, too thin to flll the slots, but it is to be understood that blades I2 are intended to t `the slots without unnecessary looseness so thatthe spaces I6 and I'lare actually imperceptible. Therefore; the eccentricity `of the binding force and reaction does not operate as a couple to produce a tilting or canting of the blade such as might possibly occur if Figure 5 Werea scale drawing and the parts were lproportioned as therein shown. Referring to Figure 2, it will be seen thatI the end ofthe front face I8 of eachbladelies on a radial line with respect to the center of the end wall 3. Where the are an even number of blades Where the blades are spaced relatively close together the segments of sleeve I lying, between the blades are sullciently res'liently deformable to insure uniform clamping pressures on all the blades. In this manner satisfactory clamping action may be obtained in a large tool by providing a larger number of blades than would be used on a small tool'. y

After the blades are securely clamped in plane by means of the screw 1 the depression 4 on end wall 3 and a beveled end 22 on sleeve I may be used as centers forgrinding the blades. After a period of use shims may be placed in the bottoms of the slots, and the blades reground, if desired, or the old bladesmay be replaced with new ones.

The invention thus provides renewable blades for a reamer so that only the blades need be discarded when worn. By avoiding the common vmethod of brazing the blades on the shank, the

injurious eiects of heat on the blades are reimoved, insuring better quality tools and allowing greater latitude in `the selection ofthe material of the blades, size of blades and thenumber of blades.

Figure 7 shows a modication employing blades in slots parallel with the tool axis, primed reference numerals being employed to indicate parts corresponding with those in Figure l. Thus, the slots and I l areparallel with the axis of sleeve I', and slot l0 is angled to causea slight rotation of the vbolt; 8 when it is moved longitudinally, to clamp the blades I 2 in substantially the saine manner as described above in connection with Figures 1-6. Y v s s It will be apparent that if it is desired to rotate the tool left handed the slots 5 and Il in Figure l, or the slot I0 in Figure 7, may be angled in the reverse directions to back up the cutting blades in the manner described for right hand rotation.

Various changes in the construction and arrangement of parts will occur to those skilledy in the art, and all such modications are included in the invention. `v The invention is to be limited only by the appended claims and the scope of the prior art.,

`I claim: f l. A reamer comprising a hollow sleeve, a bolt longitudinally slidable in said sleeve, registering slots in .said sleeve and said bolt for receiving removable blade elements, guiding means .for said bolt at an angle to said slots to move said slots circumferentially out of registry, and means for sliding said bolt along said guiding means and for securing'saidA bolt, to clamp saidv blade elements laterally and circumferentially in'said slots.

l2. A reamer comprising a hollow sleeve, a bolt longitudinally slidable in said sleeve, registering slots in oneend of said sleeve and bolt for receiving removable blade elements, a ytransverse pin through said bolt, a slot in said sleeve at an angle with saidlblade receiving slots for guiding said pin in a diagonal `path with respect to said blade receiving slots,` to move said slots Arelatively laterally out of registry as said lbolt moves longitudinally, anda screw in the other end of said sleeve for sliding said bolt to clamp said blade elements laterally and circumferentially in said registering slots.'

3. A reamer comprising a hollow sleeve, a bolt longitudinally slidable insaid sleeve, registering slots in one end of said sleeve and bolt for receiv` 4bolt to draw said bolt through said sleeve `and laterally and circumferentially clamp said blade elements in said registeringslots.

4. A reamer comprising a hollow sleeve, a bolt longitudinally slidable in said sleeve, registering slots in one end of said sleeve and bolt for receiving removable blade elements, a transversepin through said bolt, a slot in said sleeve for guiding said pin in a diagonal path with respect to said registering slots, the other end of said bolt having a screw` threaded portion, an internal Shoulder-in the other end of said sleeve, a plugseated against said shoulder, a. screw having aheadfseating in said plug and a threaded portion engaging said bolt to draw said bolt through said sleeve and move the slots in said bolt circumferentially out ofregistry with the slots in said sleeve to clamp said blade elements therebetween and machine centers formed on the ends of said sleeve for use in grinding said blades.

5. A reamer comprising a hollow sleeve, di-

ing with said iirst mentioned slots, a guide pin in said bolt, an axially directed slot in said sleeve for guiding said pinv for non-rotative longitudinal movement of said pin and` said bolt at an angle to the directions of said slots to move saidslots relatively vlaterally out of registry as said bolt moves longitudinally, and elements on said bolt adapted to laterally and circumferentially clamp said blade elements insaid diagonal slots upon said movement of said bolt. l l l 6. A reamer comprising a hollow sleeve adapted for rotation in a predetermined direction in a reaming operation, slots in said sleeve forreceiving blade elements, a bolt within said sleeve hav ing blade receiving slots registering with said first mentioned slots, means to move saidvbolt longitudinally in said sleeve and to secure said: bolt when so moved, and means to Vguide the direction of said movement of said bolt at an angletothedirections of said slots tomove said slots relatively laterally out of registry as said bolt moveslongi tudinally so that said slots in said bolt will laty erally and circumferentially bind, said blade ele- 

